The magnetic field on the axis of a circular current loop, far away (distance $x \gg R$), varies as:

1. A $1/x$
2. B $1/x^2$
3. C $1/x^3$ Correct answer
4. D $1/x^4$

Solution

Magnetic dipole on axis: $B \propto 1/x^3$.

About this question

Subject: Physics · Chapter: Magnetic Effects of Current · Topic: Biot-Savart Law

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